Spindle press



rJune27, 1939. o. KIENZLE *SPINDLE PRESS Shets-Sheet 2 20 height.

35 for example, both adapted Patented June 27, 1939 UNITED STATES PATENT' OFFICE SPINDLE PRESS Otto KienzlaBerlin-Sudende, Germany Application January 21, 1937, Serial No. 121,719

- In Germany January 23, 1936 Claims.

6 ment of the motor is preferably arranged at a permanent height'with relation to thefly-wheel of the press.

In known machines of this type, the motor is 'stationarily mounted on the framework'of the 10 machine, while the y-wheel, which always remains at the same height, `revolves a nut which can be rotated but cannot be shifted in the framework, so that the lifting spindle guided by the nut and supporting the press-stock or ram will be screwed downwards or upwards if the ily-wheel be rotated. It appears, however, that this arrangement requires a very considerable length of threads so that the framework and, thus, the entire mechanism will be of undue On the other hand, the unfavourable friction conditions and the extended expenditure of energy within the frame-work will also require a considerable expenditure of power.

The present invention relates to improvements in or relating to mechanisms of the aforesaid tion. Another object of my invention refers to arrangements wherein the driving motor of the press follows the strokes of the stock or ram. A still further feature resides in the provision of mechanically acting stops or electric contacts. to control the stroke of the press-stock. More particularly, the invention refers to presses wherein the electric-motor is mounted on a shoe or sliding member guided in the framework, and which follows the strokes of the ram,

o tion'.4 In this way, the threads of the press and likewise the motor will be effectively saved from damages.

'I'he invention will no w be described-more precisely by wayof example in and by the am'- 55 panying drawings in whichA g Fig. l is a side elevation with parts broken Aaway,`of a spindle-press wherein the motor is mounted sideways of 'a sliding member,

Fig. 2 is a fragmentary side velevation of the same, illustrating the position of the motor at the moment when the stock or ram meets the piece of work, Fig. 3 is a fragmentary sectional view taken on line e-a of rig. 1;

Fig. 4 is a side elevation, with parts broken away, of a modied form of press wherein the motor and the spindle are arranged coaxially.

Figs. 5d to 5d inclusive illustrate the operationof the electriccontrol mechanism for automatically disconnecting the motor from the spindle;

Figs. 6a to 6d inclusive illustrate the operation e of the electric control mechanism for controlling the operation of the motor; and

Figs. 7a. and 7b illustrate the operation ofthe electric contact for actuating the spindle brake mechanism Like elements are designated by like references.

In Fig. 1 the threaded spindle 'I is guided within the frame-work 2 by a nut or threaded por tion 3 and is, in addition, rotatably, but not shiftably supported at the top and at the bottom by means of a shoe or sliding member 4. The sliding member 4 is shiftably mounted preferably in tapering or dovetail guides I5 of the frame 2 so that it can follow the strokes f the spindle. 'I and of the press ram 3 connected thereto. In the arrangement of Fig. 1, the upper end of the spindle 'I carries the flywheel 6 provided with a frictional coating I6. The motor l which is preferably. of the reversible type, is mounted on the sliding member 4 which may oscillatej up` wards and downwards, said motor being tiltable by its base plate I8 around 'a pivot Il horizontally provided in the sliding member d. The motor is provided with a drive pulley 5 which is frictionally engaged with the periphery ofthe ywheel 6 and, thus, with the spindle 1. In order ,that the motor I will not tilt by its own weight around the pivot I'I into the position'shown in Flg.- 2, the base plate I8 of the motor is kept by means of one or more springs I9 against the bearing surface of the sliding member 4. This arrangement for mounting the motor provides a damping means against shocks.

In order that the shock of impact caused by the stock or rain 3 strikingagainst the piece of Work 2l will not damage the motor, the latter is adapted to be disconnected from the y-wheel 6 shortly before the shock of impact, asiappearing in Fig. 2. I'his is veffected by the engagement auv on bar 22 in any suitable manner in correspond'- ence with the desired stroke of the press spindle andwacting electrically upon means 2,8 provided for ,disconnecting the motor as will hereinafter appearmore -in detail.

Around the spindle 1, there is arranged a brake II which can retain the spindle and, thus, the ram in any desired upper position. The said brake may be operated in known manner, for example, by electromagnetic means. y It is engaged when the contact iinger or stop I4 is actuated, that is, shortly before the stock or ram 3 has attained its desired upper position. The motor I,

on the other hand, has already been thrownoif during the lifting .of the stock 3 by another contact ilnger I2 acting prior to the member I4, that is in such time that the stock 3 runs upwards under the mere inertia of the fly-wheel 6 and is, thus, almost stopped when the brake II is put into operation. Likewise. the ram can be stopped in' the upper position by one of these controlling measures alone.

The control circuit for tilting the motor I and for disconnecting` the motor and actuating the brake mechanism is more 'or less conventional arrangement and is illustratedl in Figs. 5a, b, c and d; and 6a, b, c and d; and 'Ia and b. y

Fig. 5a shows the operation of the contact 9 fo actuating the lifting mechanism in Fig. 2. The contact finger 9 is tiltable in a housing 29 about the axis 38 and resiliently mounted by means of springs 3| at both sides thereof. The electric circuit is connected at the movable contact 32 on the one end, and on the other at an closed to the magnet 28, the core 34 of which drawn into the magnet coil and themotor If is forced away from the ily wheel 8 on the pivot I1 in opposition to the force of spring I8. At the very next instant, the impact of the press bars 3 onthe object 2| takes place and the contacts assume the positions shown in Fig. 5c.

Fingers hasat thismoment just passed the stop. I8 so that the circuit to the magnet 28 is broken. Motor I is then automatically reversed by any conventional mechanism md again returned to engagement with the y wheel 8, so that the pressbar again ascends-by reversal of the rotational direction of the spindle 1.' Contact linger I thereby again f stop 5I8 as shown in Fig. 5d, without acting on magnet 28.

In the re-ascent of the press and there-.- with the slide 4. contacts I2 andA "enter-into operation. The contact finger' I2 '(reterring 'to c Figs. 6a to diissimilar to thecontact finger landisresiiientiysuspendedatbothsidea As shownin Fig. 8a, iinger I2 approaches the fixed nop ls nmsaawmcmthispcuucntne cir-pmuttotnsswinmmetniscpmea v:nach

shows the moment at which the contact finger I2 lengagesstop I8 'andistiltedtoclosethecontact 3l. Simultaneously the switch magnet 38 is `enel-gilet! and cutsoutthe drive motorby opening contact 31. At the same time, contact lying inthecircuitfortheeicctromagnetofthebrake il, is closed, thecurrentbridge 88 nowcontacting with contact 38. In Fig. 6c the upper movement is continued and nger I2 is above stop I3, in which position Contact is again open. Notwithstanding magnet 38, the bridge 39 is without current,.remaining in its assumed position, so that the circuit for the drive motor remains open. The motor can again be connected only by closing a hand switch 40 shown in Fig. 6d. Thereby acircuit for a second switch magnet 4I is completed so that said magnet again applies bridge 38 on contacts 31 and removes it from contacts 38. y

Figs. 7a and 7b show the operation of the contact finger I4 for connecting the brake. Finger I4 is spring mounted at both sides and pivotally disposed as in the'case of fingers 9 and I2.'

" of the y wheel, even after the motor is cut oiI.

Fig. l'1a shows the moment at 'which 'nger I4 has almost passed into contact vwith stop I3. Fig. 7b shows the next moment at which the contact nger I4 is tilted under the action of stop I3, so that contact 42 for the brake magnet II is closed. As shown in Figs. 6b and 6c contacts 38 are also closed at this time. so that the brake is thus actuated, which nally holds the spindle 'I fast in its uppervposition. When the motor is again energized as shown in Fig. 6d the contacts 38, Fig. 7b, are again opened so that the brake is released and spindle 'I can descend for a new impact through the action of the drive motor.

The contact fingers or stops I2 and I4 provided 'for stopping the motor and for operating the .brake may be adjusted on the sliding member 4 according to length and position of the sliding member. Bo, for instance, they can be shifted and locked on a bar 22 vertically varranged on the sliding member 4. Instead of the bar 22, there could also be arranged in the sliding member a groove with which are engaging' the shiftable contact fingers or stops. At the same time,

the members I2 and I4 couldbe rigidly connected together at a deiinite distance, like appearing from the drawings, so that they can be shifted and adjusted commonly. The distance of these contacts or stops from each other can also be reg-l ulable; it corresponds with the average time interval between stopping the motor and operating the brake.

The cbntact finger or stop l is arranged to engage witha stop or cam Il rigidly connected to the top ofthe `frax'ne work. 'Ihe contact fingers or stops I2 and I4 are acted upon by a cam I3 likewise rigidly' attached to the framework of the machine.

lBythe contact nng'ers or stops 8, I2 and I4 adiustably arranged on the sliding member 4, the positionand length oi the stroke may be arbitrarily Bo, it is,l for instance, not always necessary to lift the ram to its uppermost position. For, apart the requirement that the piece of II--canbe conveniently put into and removed from'theprmthepressstockneedsonlytobe Alifted which 'a height that. wane the stock is dropped, suflcient time is available for storing the energy in the ily-wheel.

Thus, by the improved drive a shorter falling period of the ram, if compared with known presses,

unnamed. megtent of the make and the force of the shock can arbitrarily be adjusted.

The improved press shows, besides, regarding its handling a sensibility which could not be attained up to now. y

The same advantages can also be ascribedto the embodiment shown in Fig. 4. Here, the motor is arranged axially to and above the spindle 1. It is secured to the sliding member 4 in such a manner that its rotatable portion or armature 23 is coupled with or vforms the fly-wheel, while the stationary portion or field 24 of the motor is connected with the correspondingly formed head 25 of the sliding member 4. The flywheel portion 23 is preferably rotatably supported upon the sliding member by ball collar thrust-bearings 26.

In Athis form of-the invention the tilting nger 9 and xed stop l0 are eliminated but the iingersv l2 and I4 cooperate with the xed stop I3 in the same manner as those heretofore described.

Hence when the ram 3 engages the piece of workv 2l the motor is automatically disconnected vfrom the spindle 'I by the operation of nger I2. The

, motor is thenreversed and when the spindle l stationary. threaded portion carried by said `framework, a sliding member mounted in guide' ways on said framework and terminating at one end in a press ram, a screw threaded spindle engaging said threaded portion and being rotatably 'supported by said sliding member with one end `operatively engaging said ram, the other end of said spindle carrying a fly wheel, a reversible elec-'- tric motor mounted on said sliding member and adapted to rotate said spindle, whereby said motor and sliding member are adapted to follow the strokes of said spindle.

2. A spindle press comprising a framework, a stationary threaded portion carried by said framework, a sliding member mounted in guide ways on said framework and-terminating at one end in a press ram, a screw threaded spindle engaging said threaded portion and being rotatably supported by saidsliding member with oneend operatively engaging said ram, the other end of said spindle carrying a fly wheel, a reversible electric motor mounted on said sliding member and adapted to rotate said spindle, whereby said motor and slid.

ing member are adapted to follow the strokes of said spindle, coupling means interposed between said motor and said spindle and means for disconnecting the motor from the spindle just prior to the moment said ram contacts the work piece. 3. A spindle press as claimed in claim 2 including a contact element arranged on said sliding member and adapted to cooperate with -a stop on said framework to control said disconnecting means.

4. A spindle press as claimed in claim 2 including a contact element arrangedon said sliding member and adapted to cooperate with a stop on said framework to control said disconnecting means, said contact element being adjustable on said sliding member to correspond with the desired extension and position of the spindle stroke.

, 5. A spindle press comprising a framework, a stationary threaded portion carried by said framework, a sliding member mounted in guide ways on said -frameworkand terminating at one end in a press ram, a screw threaded spindle engaging said threaded portion and rotatably supported by said sliding member with one end operatively engaging said ram, the other end of said spindle carrying a fly wheel, a reversible electric motor mounted laterally on said sliding member, a driving wheel mounted on the shaft of said motor and having a peripheral frictional engagement with said iiy wheel torotate said spindle and means for moving said driving Wheel out of contact with said fly wheel just prior to the engagement of said ram with the work piece.

i -6. A spindle press as claimed in claim 5 wherein said motor is pivotally mounted by its base plate on said sliding member, spring means normally tending to maintain engagement between said driving wheel and fly wheel and an automaticV shifting device arranged between the sliding member and the base plate of said motor for tilting the motor and driving wheel away from said y wheel in opposition to said spring means.

7. A spindle press comprising a framework, a' `stationary threaded portion carried by' said framework, a sliding member mounted in guide Ways on said framework and terminating at one end in a press ram, a screw threaded spindle en# gaging said threaded portion and rotatably sup ported by said sliding member with one end operatively engaging said ram, the other end of said spindle carrying a fly Wheel, a reversible electric motor mounted on said sliding member and adapted to rotate said spindle, said sliding member and motor adapted to follow the strokes of said spindle, coupling means interposed between said motor and said spindle, means for disconnecting the motor from said spindle j ust prior to the impact of said ram onsaid work piece, a brake adapted to engage said spindle and means for de-energizing said motor andl then operating said brake just prior to the moment said press ram reachesthe desired upper'position.

8. A spindle press as claimed in claim 7 including a series of contact elements adjustable on said sliding member and adapted to cooperate with complementary stops on said framework to actuate said disconnecting nieans, said motor deenergizing means and said spindle brake respectively.

9. A spindle press comprising aframework, a stationary .threaded portion carried by said framework, a sliding member mounted in guide ways on said framework and terminating at one endin a press ram, a screw threaded spindle engaging said threadedv portion and rotatably supported by said sliding member with one end operatively engaging said ram, the other end of said spindle carrying a ily wheel, 'areversible electric motor mounted on said sliding member, coupling means interposed between said motor and spindle,

upper position.

10. A spindle vpreses comprising a framework, a stationary threaded portion carried by said framework, a sliding member` mounted in guide ways` on said framework and terminating at one spindle, a. reversible electric motor mounted on said sliding member co-axial with said spindle, the rotor of said motor constituting said fly wheel, said sliding member and motor being adapted to i'ollow the strokes of said spindle and means for disconnecting said motor Just prior to the moi ment said ram contacts the work piece.

GTIO KIENZLE. 

